Unreliable inbound email from Gmail.

Currently we are unable to receive email from certain gmail accounts. We do get 9 out of 10 messages from Gmail.com, the 1 out of ten leave a log of "Connected to 67.1xxx.xxx.xxx but connection died. (#4.4.2)" at MessageLabs. We have been all over Exchange 2007 and spent hours with MessageLabs tech support and nobody can identify the reason for this odd behavior.

After checking further with the end users, this problem pops up when someone at Gmail attempts to reply or forward a message back to our organization. Yes the reply to address is correct and works with other domains, just not gmail.

Do you have 1-1 static nat for public IP to exchange, or are you using port xlate and outbound could a different IP address?
Example:
Do you have something like this:
static (inside,outside) pub.lic.ip.ad pri.vat.e.ip netmask 255.255.255.255 0 0
Or like this:
static (inside,outside) tcp publicip smtp private ip smtp netmask 255.255.255.255 0 0

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